Web Proxy Service May Crash When It Processes a Redirect Action (818136)


The information in this article applies to:

  • Microsoft Internet Security and Acceleration Server 2000
  • Microsoft Internet Security and Acceleration Server 2000 SP1

SYMPTOMS

The Web proxy service (W3proxy.exe) may crash (that is, experience an access violation) when it processes an HTTP redirect action on a site and content rule that denies access.

CAUSE

ISA Server may not include the NULL terminating byte when ISA Server copies the redirect URL to a temporary buffer. Because of this, more HTTP header data may be sent back to the client in the redirect response, and sometimes the Web proxy service may crash.

RESOLUTION

You must install ISA Server Service Pack 1 (SP1) before you install the following hotfix.

For additional information about how to obtain the latest ISA Server service pack, click the article number below to view the article in the Microsoft Knowledge Base:

313139 How to Obtain the Latest Internet Security and Acceleration Server 2000 Service Pack

A supported hotfix is now available from Microsoft, but it is only intended to correct the problem that is described in this article. Only apply it to systems that are experiencing this specific problem. This hotfix may receive additional testing. Therefore, if you are not severely affected by this problem, we recommend that you wait for the next service pack that contains this hotfix.

To resolve this problem immediately, contact Microsoft Product Support Services to obtain the fix. For a complete list of Microsoft Product Support Services phone numbers and information about support costs, visit the following Microsoft Web site:

http://support.microsoft.com/contactus/?ws=support

Note In special cases, charges that are ordinarily incurred for support calls may be canceled if a Microsoft Support Professional determines that a specific update will resolve your problem. The usual support costs will apply to additional support questions and issues that do not qualify for the specific update in question. A supported fix is now available from Microsoft, but it is only intended to correct the problem that is described in this article. Apply it only to computers that are experiencing this specific problem.

To resolve this problem, contact Microsoft Product Support Services to obtain the fix. For a complete list of Microsoft Product Support Services phone numbers and information about support costs, visit the following Microsoft Web site:

http://support.microsoft.com/contactus/?ws=support

NOTE: In special cases, charges that are ordinarily incurred for support calls may be canceled if a Microsoft Support Professional determines that a specific update will resolve your problem. The usual support costs will apply to additional support questions and issues that do not qualify for the specific update in question.

The P1 version of this fix has the file attributes (or later) that are listed in the following table. The dates and times for these files are listed in coordinated universal time (UTC). When you view the file information, it is converted to local time. To find the difference between UTC and local time, use the Time Zone tab in the Date and Time tool in Control Panel. 
   Date         Time   Version            Size    File name
   --------------------------------------------------------------
   12-Jun-2003  07:37  3.0.1200.276      178,448  Mspadmin.exe     
   12-Jun-2003  07:37  3.0.1200.276      103,184  Msphlpr.dll      
   12-Jun-2003  07:36  3.0.1200.276      391,952  W3proxy.exe      
   12-Jun-2003  07:37  3.0.1200.276      299,280  Wspsrv.exe
This fix also applies to the French, German, Spanish, and Japanese versions of ISA Server.

WORKAROUND

To work around this problem, disable the URL redirect action on any site and content rule that denies access to a specific destination.

To disable a redirect action on a site and content rule, follow these steps:
  1. In the ISA Server Microsoft Management Console (MMC), expand Servers and Arrays, and then expand the server name.
  2. Expand Access Policy, and then click Site and Content Rules.
  3. In the Action column, find all site and content rules that redirect to a URL. For example, the action may be "Redirect to: http://www.microsoft.com/isaserver".
  4. In Advanced view, right-click a rule, and then click Properties .
  5. On the Action tab, click to clear the If HTTP request, redirect request to this URL: check box.
  6. Click OK to close the dialog box.
Repeat these steps for every rule that has a redirect action specified.

Note These steps apply to ISA Standard Edition. The steps for ISA Enterprise Edition may be a little different.

STATUS

Microsoft has confirmed that this is a problem in the Microsoft products that are listed at the beginning of this article.

MORE INFORMATION

To set up a site and content rule that denies access and that redirects the request, follow these steps:
  1. In the ISA Server MMC, expand Servers and Arrays, and then expand the server name.
  2. Expand Access Policy, and then click Site and Content Rules.
  3. Create a site and content rule or select an existing rule that you want to configure. In Advanced view, right-click the rule, and then click Properties.
  4. Click the Action tab, and then click to select the Denied and the If HTTP request, redirect request to this URL check boxes.
  5. In the input that is listed below If HTTP request, redirect request to this URL, type the URL that you want to redirect to (for example, "Redirect to: http://www.microsoft.com/isaserver/").
Modification Type:MinorLast Reviewed:10/11/2005
Keywords:kbHotfixServer kbQFE kbfix kbBug kbISAServ2000preSP2fix KB818136 kbAudDeveloper kbAudITPRO
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